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Copyright © 2012 Vista Higher Learning. All rights reserved. 13.3-1
Conjunctions are words or phrases that connect other words and clauses in sentences. Certain conjunctions commonly introduce adverbial clauses, which describe how, why, when, and where an action takes place.
Copyright © 2012 Vista Higher Learning. All rights reserved. 13.3-2
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With certain conjunctions, the subjunctive is used to express a hypothetical situation, uncertainty as to whether an action or event will take place, or a condition that may or may not be fulfilled.
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Here is a list of the conjunctions that always require the subjunctive.
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The infinitive, not que + [subjunctive], is used after the prepositions antes de, para, and sin when there is no change of subject. ¡Atención! While you may use a present participle with the English equivalent of these conjunctions, in Spanish you cannot.
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Conjunctions with subjunctive or indicative
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With the conjunctions above, use the subjunctive in the subordinate clause if the main clause expresses a future action or command.
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With these conjunctions, the indicative is used in the subordinate clause if the verb in the main clause expresses an action that habitually happens, or that happened in the past.
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Completa las oraciones con las formas correctas de los verbos.
1. Voy a estudiar ecología cuando __________ (volver) a la universidad.
2. No podemos evitar la lluvia ácida a menos que todos ________ (trabajar) juntos.
3. No podemos conducir sin ________ (contaminar) el aire.
4. Siempre recogemos mucha basura cuando ________ (ir) al parque.
5. Elisa habló con el presidente del Club de Ecología después de que ________ (terminar) la reunión.
6. Vamos de excursión para ________ (observar) los animales y plantas.
7. La contaminación va a ser un problema muy serio hasta que nosotros ________ (cambiar) nuestros sistemas de producción y transporte.
8. El gobierno debe crear más parques nacionales antes de que los bosques y ríos ________ (estar) completamente contaminados.
9. La gente recicla con tal de que no ________ (ser) díficil.
vuelva
